Abstract No investigations have been performed on the rheological characteristics of cemented paste backfill (CPB) that contains nano-silica (nS) particles, although the addition of nS to CPB has been regarded as a promising approach to enhance the strength and strength gain rate of CPB at an early age. The present papers present the results of an experimental study on the impact of nano-silica (nS) on the rheological characteristics of CPB. It is found that the nanoparticles considerably impact the rheological properties of CPB, and thus alter its flow ability. The yield stress and viscosity of the CPB specimens incorporating nS are higher than that of the samples without nS. However, the magnitude of this effect is dependent on the binder type, curing time and water content. The findings described and discussed in this manuscript will support the development of the nano-CPB technology and its successful application in underground mine backfill operations.

中文翻译：

---

含有纳米二氧化硅颗粒的胶结充填材料的流动能力

摘要 没有对含有纳米二氧化硅 (nS) 颗粒的胶结膏体回填 (CPB) 的流变特性进行研究，尽管在 CPB 中添加 nS 被认为是提高强度和强度增益率的有前途的方法。早年的CPB。本论文介绍了一项关于纳米二氧化硅 (nS) 对 CPB 流变特性影响的实验研究结果。发现纳米颗粒显着影响 CPB 的流变特性，从而改变其流动能力。掺入 nS 的 CPB 试样的屈服应力和粘度高于不含 nS 的试样。然而，这种影响的大小取决于粘合剂类型、固化时间和水含量。